20In that respect is it necessary to reject the argument of the German Government to the effect that a Member State may not prohibit the marketing in its territory of articles of precious metal hallmarked by the producers themselves in the Member State of exportation, where compliance with the law and, consequently, consumer protection and the safeguarding of fair trading are assured by a range of measures capable of ensuring that the hallmark functions as a guarantee. It argues that such is the case under the German legislation, which provides for quality rules for the manufacturer, penalties under public law if those rules are infringed, action under the Law against Unfair Competition by certain associations vested with the power to issue warnings, the manufacturer's guarantee and, finally, special training given to gold-and silversmiths.